Improvement in knob-latches



J. H. KINSMAN.

KNOB-LATCH.

Patented Dec.26, 1876.

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PATENT Qrrrca JOHN H. KINSMAN, OF SALEM, MASSACHUSETTS.

IMPROVEMENT lbl KNOB-LATCHES.

Specification forming part of Letters Patent No. 185,760, dated December26, 1876; application filed September 12, 1876.

To all whom it may concern:

Be it known that 1, JOHN H. KINSMAN, Salem, in the county of Essex andState of Massachusetts, have invented certain new and usefulImprovementsin Latch Locks, of which the following is a specification:

Figure 1 is a plan view with the top plate removed. Fig. 2 is a sideelevation of the lock, showing, in section. the rose-shank, spindle, andwedge or key. Fig. on a vertical line through the rose, spindle, andspindle-sleeve, with wedge in position for locking the parts.

The object of the present invention is to produce a lock wherein by onekey or suitable device the handle and latch can both beheld secure atthe same time; and to this end it consists more particularly in making arecess or slot in the rose-shank and inthe spindle, and in adaptingthereto a key or wedge, so that it will lock the spindle, while at thesame time a spur or shoulder on the hub inside the lock serves to hold apin or lug depending from the inner end of the latch, whereby neitherthe handle can be turned, nor can the bolt be thrown back by any meansoperating ,upon it, all as will now be fully set forth and explained. v

in the accompanying drawings, A denotes any ordinary lock-case,ha inglatch B, with rod or'tail-piece b and spring I), constructed andattached in the usual way.

a serve to guide the rod or tail-piece, and afford support for the seat0 of the spring. The

latch is moved in the usual way by the spin-.

dle G of the handle G operating through the hub D on the latch-arm B,which depends and is curved so as tofit upon the side of said hub. ()nthe upper or top part of said hubis a spur, d, adapted to act upon theinner face ofarm B when thehandle is turned, and thus throw back thelatch. When the latch is out the said lug rests between the upper partof said arm B and-a pin or lug, E, which is fixed or tail-piece b of inthe under side of the rod 3 is a sectional view the handle G,

The posts a the latch. One office of the lug is to stay or of limit theoutward movement of the latch by engaging against post a. The shankf ofthe rose F is slotted at f, and likewise the spindle G is slotted at g.When the bolt is thrown these two slots coincide, and afford a seat oropening, into which a wedge or key, H, can be fitted. When this is donethe handle cannot be turned, beca'use the wedge or key, engaging on theshank of the rose, will allow no movement, while on the inside of thelock the pin Eis held on the one side by posts a a, and on the other bythe spur d of the hub D. In this way the latch may be held when thrownoutward, and cannot be moved by any strain on nor can the latch bepushed backward by any pressure on its outer end. Thus, byasingleinstrument, the latch can be locked securely against all attempts fromthe outside to throw back the bolt, whether operating on the handle oron the latch.

I have in this instance shown a wedge as adapted to lock these parts,and this can be attached to the look by a chain, or in any convenientway or mannerbut it may be found of advantage in many locks to havesimply a key of such shape and size as to be readily adapted to fit intothe seat in the rose-shank and spindle, or any convenient device may beused for this purpose.

Having thus described my invention, what I consider new, and desire tosecure by Letters Patent, is

In a look, as herein described, the combination of the slottedrose-shank, slotted spindle, and wedge with the hub D, having spur d,and latch-arm B, rod b, and lug E, substantially as and for the purposesset forth.

In testimony that I claim the foregoing as my own I afiix my signaturein presence of two witnesses.

' JOHN H. KINSMAN. Witnesses:

WILLIAM FITCH, PHILIP MoNIoKLE.

